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利用应变控制式拉伸试验仪研究重塑黏性土的单轴抗拉特性,探究了含水率、干密度、高径比对试样应力应变曲线、抗拉强度、峰值应变以及拉伸能量的影响,并分析了其内在机理,讨论了土体抗拉强度的来源。试验结果表明:(1)含水率和干密度对抗拉强度影响很大,呈线性相关,具体表现为:含水率升高,抗拉强度先增大后减小;干密度越大,抗拉强度越大。在高径比相同的情况下,高度和直径的变化对抗拉强度影响不大;(2)峰值应变由应力应变曲线形态决定,因而主要受土样的抗拉强度、可塑性以及破坏方式影响;(3)应力应变曲线大致可分为四类,曲线形态各不相同;(4)拉伸能量由应力应变曲线形态决定。含水率影响试样的抗拉强度和塑性,干密度影响试样的抗拉强度和内部结构,因而两者对拉伸能量的影响很大。高径比不变时,试样高度和直径的变化对拉伸能量影响不大。
The strain-controlled tensile tester was used to study the uniaxial tensile properties of remoulded cohesive soil. The effects of moisture content, dry density and height-diameter ratio on stress-strain curve, tensile strength, peak strain and tensile energy Influence and analyze its internal mechanism, discussed the source of soil tensile strength. The results show that: (1) moisture content and dry density have a great influence on the tensile strength, which is linearly correlated. The concrete manifests as follows: the water content increases, the tensile strength first increases and then decreases; the greater the dry density, the tensile strength The bigger When the height-diameter ratio is the same, the variation of height and diameter have little effect on the tensile strength. (2) The peak strain is determined by the shape of the stress-strain curve and is mainly affected by the tensile strength, plasticity and failure mode of the soil sample. 3) The stress-strain curve can be roughly divided into four categories, with different curve shapes. (4) The tensile energy is determined by the shape of the stress-strain curve. The moisture content affects the tensile strength and plasticity of the sample, and the dry density affects the tensile strength and the internal structure of the sample, so both have a great influence on the tensile energy. When the height-diameter ratio is constant, the change of specimen height and diameter has little effect on the drawing energy.